Carpenter&#39;s square.



E. LAAKKONEN.

CARPENTERS SQUARE.

APPLICATION FILED JUNE 2l. 1915- 1,191,008. Patented Ju1y11,1916.

nm W H 4 m .00; ;,V if; .1 L wflfz/Lz Mmmm". n. n.

TED STATEs Ariiiiiiai orrrcn.

EPHIBIAIlVIT LAAKKONN, vOlli'1V1IO1\T'1i|-SSEN, PENNSYLVANIA.

CARPRNTERS SQUARE.

the following to be a full, clear, and-exact description of the invention, such as will enable others skilled in the art to which it make and use the same.

appertains to relates to carpenters This invention squares.

The object of the invention resides in the provision of a carpenters square embodying an improved construction whereby the cuts and lengths of the various types of rafters may be quickly and easily determined without resorting to any complicated mathematical computation.

With the above and other objects in view the invention consists in the details of construction and in the arrangement and combination of parts to be hereinafter more fully described and particularly pointed out in the appended claim.

In describing the invention in detail reference will be had to the accompanying drawings wherein like characters of reference denote corresponding parts in the several views, and in which- Figure 1 is a side elevation of a carpenters square constructed in accordance with the invention; Fig. 2, a view similar to Fig. 1 looking at the opposite side of the square and with the setting` arm in an adjusted position, part of the arm being broken away; Fig. 3, a section on the line 3-3 of Fig. 1; Fig. l, a section on the line 4--4 of Fig. 1; Fig. 5, a partial longitudinal section of the square, and Fig. 6, a section on the line 6-6 of Fig. f

Referring to the drawings the improved square is shown as comprising a blade 10 and a tongue 11. The blade 10 is provided along its outer and inner edges with inch graduations 12, while the tongue 11 is provided along its outer edge with inch graduations 13. The blade 10 is provided with a recess 14 in which is mounted a longitudinally adjustable section 15, which section is also suitably graduated as at 16. The tongue 11 is provided in its outer edge with a groove 17 in which is adapted to seat a pivoted extension 18, the pivot of said eX- tension being disposed at the junction of i speciiication of Letters raient. Application meal June 21, 1915. serial No. 35,379.

Patented July 171, 1916.

the blade and tongue and when saidezrtension is moved to its limit away from the tongue 11 the outeredge thereofy registerswith the outer edge ofthev blade and the outer edge of thesection 15. Formed integral lwith the tongue 11 on the inner edge thereof is a quadrant 19 which is adapted to .be embraced by the arms 20 of -a forked set.- lting member 21, said arms being pivotally connected to the square adjacent the junction of the inner edges of the blade and tongue. The quadrant 19 has one face provided with graduations 22 indicating the pitches of Octagon hip and valley rafters, graduations and scales 23 indicating the lengths of octagon hip and valley rafters, graduations 24: indicating the pitches of ordinary hip and valley rafters, and graduations 25 indicating the lengths of ordinary hip and valley rafters. The setting member carries indicators 26 through the medium of which the graduations 23 and 25 may be readily read by bringing a given edge of said indicators into registration with respective graduations 23 and 25. tions 22 and 24 are read along the edge of the armv20 which carries the indicators 26. rlhe other face of the quadrant 19 is provided with graduations 27 indicating the lengths of common rafters and graduations 28 indicating the pitches of common rafters. By setting the member 21 to a desired graduation and taking the cut along the outer edge of the tongue or the outer edge of'the blade while the member 21 bears against the edge of the timber the desired result can be reached. Vhether the cut be The graduaj taken along the edge of the tongue or the..

outer edge of the blade depends on the particularproblem in hand and will be apparent to those skilled in the art.

In order to .lock the member 21 in a desired adjustment for solving a given problem there is mounted in the curved edge of the `quadrant 19 a plate 29 provided with notches 30. Mounted on the member 21 is a pivoted latch 31 movable transversely of the member and normally held in position to engage in a desired notch 30 by a spring 32. This latch is provided with a notch 33 adapted to register with the plate 29 when the latch 31 is moved to a predetermined position against the influence of the spring 32. Vhen this notch 33 registers with the plate 29 it will be obvious that the member 21 can be adjusted freely on its pivot. Slidably mounted in the member 2l is a push pin 34 which is operatively connected to the latch 3l. By forcing this pin 34 inwardly the latch 3l can be moved against the influence of the spring 32 to register the notch 33 with the plate 29 and permit free adjustment of the member 21.

When the notch 33 is out of the plane of the plate 29 it will Ybe obvious that a portion of the latch 3l will be disposed in a given notch 30 and thereby lock the member 2l against pivotal movement.

' What is claimed is A carpenters square comprising a blade and tongue, a. quadrant carried by the tongue on the inner edge thereof, a notched plate mounted in the curved edge of the quadrant, a forkedsetting arm pivoted to the square and embracing the quadrant, and

a pivot latch mounted on the setting arm EPHRAIM LAAKKONEN.

Witnesses:

GEORGE E. WAHLs'roN,` AXEL RUNTI.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

